So I've run into a little maths problem within my story to do with the chronology and I was wondering if the more mathematically minded of you guys could help. In the my story there are two dimensions, called Realms (well there's more than two but only two concern this problem.). We'll call them A and B. The thing is time passes differently in them. In the backstory there was a massive battle and since then 10,000 years have passed in A, but only 10 in B (So for every year in B we have a 1000 in A.). So lets say someone spends a week in B and then returns to A. Can anyone figure out, or does anyone know a formula for figuring out how much time would have passed in A after a week in B? Maths really isn't my strong point you see.